linux-imx

/*

 * ZTE's zx2967 family thermal sensor driver

 *

 * Copyright (C) 2017 ZTE Ltd.

 *

 * Author: Baoyou Xie <baoyou.xie@linaro.org>

 *

 * License terms: GNU General Public License (GPL) version 2

 */

​

#include <linux/clk.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/iopoll.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/thermal.h>

​

/* Power Mode: 0->low 1->high */

#define ZX2967_THERMAL_POWER_MODE   0

#define ZX2967_POWER_MODE_LOW       0

#define ZX2967_POWER_MODE_HIGH      1

​

/* DCF Control Register */

#define ZX2967_THERMAL_DCF      0x4

#define ZX2967_DCF_EN           BIT(1)

#define ZX2967_DCF_FREEZE       BIT(0)

​

/* Selection Register */

#define ZX2967_THERMAL_SEL      0x8

​

/* Control Register */

#define ZX2967_THERMAL_CTRL     0x10

​

#define ZX2967_THERMAL_READY        BIT(12)

#define ZX2967_THERMAL_TEMP_MASK    GENMASK(11, 0)

#define ZX2967_THERMAL_ID_MASK      0x18

#define ZX2967_THERMAL_ID       0x10

​

#define ZX2967_GET_TEMP_TIMEOUT_US  (100 * 1024)

​

/**

 * struct zx2967_thermal_priv - zx2967 thermal sensor private structure

 * @tzd: struct thermal_zone_device where the sensor is registered

 * @lock: prevents read sensor in parallel

 * @clk_topcrm: topcrm clk structure

 * @clk_apb: apb clk structure

 * @regs: pointer to base address of the thermal sensor

 */

​

struct zx2967_thermal_priv {

    struct thermal_zone_device  *tzd;

    struct mutex            lock;

    struct clk          *clk_topcrm;

    struct clk          *clk_apb;

    void __iomem            *regs;

    struct device           *dev;

};

​

static int zx2967_thermal_get_temp(void *data, int *temp)

{

    void __iomem *regs;

    struct zx2967_thermal_priv *priv = data;